LP2997 DDR-II Termination Regulator | TI.com

LP2997
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DDR-II Termination Regulator

DDR-II Termination Regulator - LP2997
Datasheet
 

Recommended alternative parts

  • LP2996-N  -  DDR-I And DDR-II Linear Termination Regulator

Description

The LP2997 linear regulator is designed to meet the JEDEC SSTL-18 specifications for termination of DDR-II memory. The device contains a high-speed operational amplifier to provide excellent response to load transients. The output stage prevents shoot through while delivering 500mA continuous current and transient peaks up to 900mA in the application as required for DDR-II SDRAM termination. The LP2997 also incorporates a VSENSE pin to provide superior load regulation and a VREF output as a reference for the chipset and DIMMs.

An additional feature found on the LP2997 is an active low shutdown (SD) pin that provides Suspend To RAM (STR) functionality. When SD is pulled low the VTT output will tri-state providing a high impedance output, but, VREF will remain active. A power savings advantage can be obtained in this mode through lower quiescent current.

Features

  • Source and Sink Current
  • Low Output Voltage Offset
  • No External Resistors Required
  • Linear Topology
  • Suspend to Ram (STR) Functionality
  • Low External Component Count
  • Thermal Shutdown
  • Available in SOIC-8, SO PowerPAD-8 Packages

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WEBENCH® Designer LP2997

DDR type
  Range
Ambient Temp  °C -40 to 125°C

Parametrics

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Part number Order DDR memory type Control mode Iout VDDQ (Max) (A) Iout VTT (Max) (A) Iq (Typ) (mA) Output Vin (Min) (V) Vin (Max) (V) Features Rating Operating temperature range (C) Package Group Package size: mm2:W x L (PKG)
LP2997 Order now DDR2           0.5     0.32     VREF
VTT    
1.8     5.5     Shutdown Pin for S3     Catalog     0 to 125     SO PowerPAD | 8
SOIC | 8    
8SO PowerPAD: 19 mm2: 3.9 x 4.89 (SO PowerPAD | 8)
8SOIC: 19 mm2: 3.91 x 4.9 (SOIC | 8)    
LP2996-N Order now DDR
DDR2    
      1.5     0.32     VREF
VTT    
1.8     5.5     Shutdown Pin for S3     Catalog     0 to 125     SO PowerPAD | 8
SOIC | 8
WQFN | 16    
8SO PowerPAD: 19 mm2: 3.9 x 4.89 (SO PowerPAD | 8)
8SOIC: 19 mm2: 3.91 x 4.9 (SOIC | 8)
16WQFN: 16 mm2: 4 x 4 (WQFN | 16)    
LP2996A Order now DDR
DDR2
DDR3
DDR3L    
      1.5     0.32     VREF
VTT    
1.35     5.5     Shutdown Pin for S3     Catalog     0 to 125     SO PowerPAD | 8     8SO PowerPAD: 19 mm2: 3.9 x 4.89 (SO PowerPAD | 8)    
LP2998 Order now DDR
DDR2
DDR3
DDR3L    
      1.5     0.32     VREF
VTT    
1.35     5.5     Shutdown Pin for S3     Catalog     -40 to 125     SO PowerPAD | 8
SOIC | 8    
8SO PowerPAD: 19 mm2: 3.9 x 4.89 (SO PowerPAD | 8)
8SOIC: 19 mm2: 3.91 x 4.9 (SOIC | 8)    
LP2998-Q1 Order now DDR
DDR2
DDR3
DDR3L    
      1.5     0.32     VREF
VTT    
1.35     5.5     Shutdown Pin for S3     Automotive     -40 to 125     SO PowerPAD | 8     8SO PowerPAD: 19 mm2: 3.9 x 4.89 (SO PowerPAD | 8)    
TPS51100 Order now DDR
DDR2
DDR3
DDR3L
LPDDR3    
S3
S5    
  3     0.5     VREF
VTT    
1.2     3.6     S3/S5 Support     Catalog     -40 to 85     HVSSOP | 10     10HVSSOP: 15 mm2: 4.9 x 3 (HVSSOP | 10)    
TPS51200 Order now DDR
DDR2
DDR3
DDR3L
DDR4
LPDDR2
LPDDR3    
D-CAP
S3
S4/S5    
  3     0.5     VREF
VTT    
1.1     3.5     S3/S5 Support     Catalog